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Guy D. Collins, Ph.D. Extension Cotton Agronomist

Guy D. Collins, Ph.D. Extension Cotton Agronomist. Overview of Cotton Agronomic Research & Extension Program. What is your most limiting factor ??? Water (soils, irrigation capacity, historical rainfall) Weed control (technology options for pigweed control)

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Guy D. Collins, Ph.D. Extension Cotton Agronomist

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  1. Guy D. Collins, Ph.D. Extension Cotton Agronomist Overview of Cotton Agronomic Research & Extension Program

  2. What is your most limiting factor ??? Water (soils, irrigation capacity, historical rainfall) Weed control (technology options for pigweed control) Plant growth (achieving optimal height, droughty soils, PGRs) Diseases, nematodes, insects (leaf hairiness) Planting date, timeliness of inputs Realistic Yield Potential – field x field basis Variety performance information… Official Variety Trials (OVT) UGA Uniform Cotton Variety Performance Evaluation Program (County agents) Industry variety trials Growers with similar soils/practices Your own experience Variety selection criteria

  3. UGA OnFarm Cotton Variety Performance Evaluation Program

  4. 2010 UGAUCVPEPStability & Consistency(TOP 2) Collins & Whitaker, 2010

  5. 2011 UGAUCVPEP Stability & Consistency(TOP 1) Collins & Whitaker, 2011

  6. 2012 Roundup-Based On-Farm Trials (TOP 3) Collins & Whitaker, 2012

  7. 2012 Liberty-Based On-Farm Trials (TOP 2) Collins & Whitaker, 2012

  8. Collins & Whitaker, 2012 2012 Cost of Improper Variety Selection (Roundup-based Trials)

  9. Collins & Whitaker, 2012 2012 Cost of Improper Variety Selection (Roundup-based Trials) For 2012 Acreage: $157,300,000 - $444,600,000

  10. 2010 GA County Variety Trials - Conventionals Stability & Consistency Collins & Whitaker, 2010

  11. www.ugacotton.com

  12. www.ugacotton.com

  13. 1st Position Boll Distribution Bolls/A Main-stem Node

  14. * *

  15. * * * *

  16. Relative PGR Requirements of Cotton Varieties (PGR REQUIRMENTS VARY – use only as guide)

  17. UGA Irrigation RecsWeekly Water Requirements (inches per week) First Bloom

  18. SSDI & OVHD Irrigation Research

  19. Sensor-Based Treatments • Watermark moisture potential sensors

  20. Treatments • Checkbook method-UGA determination for water requirements:

  21. Lint Yield: Deep vs Shallow SDI* A AB AB AB AB AB B C C C D p< 0.1 *Data pooled over locations & varieties

  22. Lint Yield: SDI Depth by Trigger* A AB AB AB AB AB B C C C D p< 0.1 *Data pooled over locations & varieties

  23. Lint Yield – Variety * Irrigation Treatment (averaged across locations) A B C C C C C D E E • FM 1740 > DP 1050 = 40 cb, 70 cb, and 100% • FM 1740 = DP 1050 = dryland, 65% UGA recs.

  24. Total Water (Irr & Rain)

  25. Prebloom Irrigation FM 1944 GLB2 DP 0912 B2RF

  26. Prebloom Irrigation DP 1050 B2RF PHY 499 WRF

  27. Final Plant Height* A A B BC C C B D No PGR ST 2 ST 3 ST 4 MC 8 MC 12 cm DP 555 FM 1740 p = 0.0669 p = < 0.0001 *Data pooled over locations and PGR trt *Data pooled over locations and variety

  28. Final Plant Height* cm A B B BC BCD CDE CDE DEF DEF EFG FG G p = 0.0757 *Data pooled over locations

  29. Final Plant Height* cm p = 0.0757 *Data pooled over locations

  30. Lint Yield DP 555 BR* kg/ha * * * * * * p = 0.1590 *Data pooled over locations

  31. Lint Yield FM 1740 B2F* kg/ha * * * p = 0.1590 *Data pooled over locations

  32. DP 1050 B2RF FM 1740 B2F Mepex 8 oz/A @ 9-10 leaves Mepex 12 oz/A @ 9-10 leaves

  33. DP 1050 B2RF FM 1740 B2F Stance 2 oz/A @ 9-10 leaves Stance 3 oz/A @ 9-10 leaves

  34. Plant Height (inches) a ab abc abc bcd bcd de cde de ef fg gh h gh i i

  35. Plant Height (inches)

  36. Avoid yield-limiting PGR applications

  37. 2,4-D Drift

  38. Universal Quantification of Maturity

  39. Lint Yield LSD = 187 Lb / acre 2 Applications 1 Application

  40. Lint to Seed ratio (%) Variety LSD (0.05) = 60

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